Oumier Wasp Nano RTA is the latest RTA based on Wasp Nano RDA. It is a 23mm diameter rebuildable tank which made of high-quality SS304 and standard 2ml liquid capacity. It mainly features easy single coil build deck and adjustable bottom airflow design, bringing optimal vaping flavor to users. Nice and clean chamber with smooth treading that fills via sliding top side-fill port offers you ample juice storage to enjoy your puff too. OBS engine Nano RTA improves the versatility and performance of the flavor-oriented atomizer tank, supporting single coil building with concentrated chamber to generate dense and flavorful taste. So the Oumier Wasp Nano RTA is really an ideal atomizer for DIY fans. 4 colors are optionalm for you to choose.